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I Didn't know there were Yamaha FM synths that had general midi sound sets, none of the ones I own do, dx7, dx9, tx802 fb01. It's definitely a 90s thing though.

In that case you are pretty much on the right track with the Roland sound canvas synths. Basically you want to find something with the general midi logo on it. There are a ton of synthesisers around, but most professional grade ones do not support general midi and thus would not be much use for...

What about 27c010, 27c020 and 27c040? I never found direct replacements 27c040 EPROM and 39sf040 EEPROM have a slightly different pinout, which will require some bodge wires...

I've seen solder cup db connectors soldered to a double sided pcb edge, maybe it's possible to make an adapter pcb?

Is this working with the copy protection used by older opcode and digidesign authorization disks? I already have a greaseweasle, but it can't write 800k Mac disks yet.

I suppose I could just put a 90° pin header on the pi zero. Or  attach it with a cable?

Wow I'm really impressed by the work you guys have done! I bought a raspberry pi when I first saw rascsi, but It looks like the quick and dirty diy version without bus transcivers has a few problems, so I was planning to make a PCB eventually. I'm really glad I didn't have to though, because...

i think i have some 27c400 and 27c800 16 bit eproms too (used for amiga kickstart) hopefully the pinout is the same. i've made a few adapter pcbs like that recently as i've been reprogramming the sound Roms on old drum machines, sometimes they have mask roms with non standard pinouts. i made...

i haven't had the chance to open it up again, and i found a rom image online, it's 512k, so thats going to fit into a 27c040. the socket actually has extra unused pins for a bigger chip. according to Designing Cards and Drivers for the Macintosh Family 3rd Edition 1992.pdf the classic has a...

The XO classic has it's rom on a 32 pin Dip mask rom, which looks at first glance to be compatible with a 27c020 eprom i suppose my first step should be to dump the rom, copy it to a compatible eprom and see if it works.  

Has anybody ever made a Custom boot rom for the Classic? the XO classic boots really quickly with the rom disk and the rom slot can hold a bigger ROM, it'd be nice to have my own custom Rom. i have a Classic and an eprom programmer. but my knowledge of the mac rom and floppy format are quite...